Pulling-over machine



I. T. LANCASTER.

PULLlNG-OVER MACHINE.

APPLICATION FILED FEB.16.1918. RENEwED APR. 14,1920.

Patented Nov. 8, 1921.

2 SHEETS-SHEET I..

m N w w J. T. LANCASTER.

PULLING-OVER MACHINE.

APPLICATION FILED FEB. I6, 1918. IIEIIEwEn APR. I4, 1920.

Patented Nov. 8, 1921.

2 SHEETS-SHEET 2.

III 100 UNITED vSTATE-s PATENT OFFICE.

MACHINERY CORPORATION, or NEW JERSEY.

PATER'SON, NEW

JERSEY, A CORPORATION `F PULLING-OVER MACHINE.

.Specification of Letters Patent.

Patented Nov. s, 1921.

Application filed February 16, 1918, Serial No. 217,573. Renewed April 14, 1920. Serial No. 373,954.

Y To all whom t may concern.:

` Be it known that I, JOHN T. LANCASTER, a citizen of the United States, residing at Haverhill, in the county of vEssex and `tate of Massachusetts, have invented certain Improvements in Pulling-Over Machines, of Vwhich the vfollowing description, in conne:- `tion with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

. This invention relates toy pulling-over machines and particularly to means for controlling the upper pulling mechanism of such machines.

It has'been proposed heretofore 'to provide vin pulling-over machines, in addition to mechanism for initially pulling the upper, auxiliary power driven mechanism under manual control foruse in moving one or more vof the upper pulling grippers subsequently to the initial pull, either in a direction to subjectthe upper to an additional tension or in a direction to relax 'the tension. Mechanism vby the use of which such supplemental movements .of the grippers ma;v be effected is shown andv described, for ex'- ample, in United States Letters Patent No. 1,383,536 granted on March .9, 1920, upon an application filed by me and Eli Brothers as joint inventors. An important object of thisfinvention is to provide means of simple and improved construction for controllingmore effectually than heretofore the upper vpulling mechanism of machines of the above described and other types in order to facilitate such operation of the mechanism as to produce the precise results desired, and to guard against bi'eakage of parts or other kundesirable consequences, through op eration of the upper pulling mechanism at the wrong time, or through other conditions such as might cause interference between such mechanism and other portionsvof the machine.

For'the accomplishment of the above and other objects the invention provides among its more important features, novel means for controlling the transmission' of power to a gripper or grippers by manually controlled gripper operating mechanism and also novel means for insuring such control` of a grip peras to permit it to be returned to its idle position with other portions of the machine. These and other features of the invention, includingnovel means whereby manual control of gripper operating mechanism to lproduce precise and accurate results in the tensioning of the upper is facilitated, together with -certain details of construction and combinations of parts, will now be described with reference to the accompanying drawings, which show one embodiment of the invention, and will be pointed out in the claims.

In the drawings,

Figure 1 is la side elevation of a pullingover machine in which the invention is embodied, and

Fig. 2 is an enlarged perspective view of a portion of the mechanism on one side of the machine for imparting supplemental movements to one of the side grippers, and the `manual controlling means therefor.

' The illustrative machine is similar in its general organization to the machine shown in the ,patent hereinbefore referred to, and

only such portions of the mechanism as it is necessary to refer to foi' an understanding of the present invention will be described herein in detail. i

The machine comprises the usual side grippers 2 connected to updraw levers 1 pivoted at 6 to the frame of the machine and operated in the usual manner by a cam 8 on a cam shaft 10 through connections comprising a slide 12 and rods 14 projecting upwardly from the slide, the rods being surrounded by springs 16 which bear at their upper ends on nuts 18 on the rods and are arranged with their lower ends in position to impart movement to the rear end portions of the levers '4 when the slide is moved downward to compress the springs 16. After the slide 12 has been thus operated to impartV the first updraw movement to the side grippers, the machine vcomes to rest in the usual manner with the upper under tenrelax in a greater or less degree the tension at one or both sides of the upper. This mechanism comprises separate connections between the power shaft v2() and each of the side grippers, together with separate controlling meansl for each gripper operating` mechanism'to enable the operator to cause .y either or rboth of the side grippers to VVmove in the directionand to the extent desired'. rSince these connections and the controlling meaiistherefor are duplicates of each other, only the mechanism for effecting and vcontrolling the movement of the gripperat'one side of the machine is shown and will be described-,herein in detail.

yThe shaft 20 carries a constantly driven gear 22 which drives a pinion 24 on a shaft Y 26, this shaftcarrying a worm 28 which is arranged to drive a worin gear 30 fast on a vertical shaft 32. The shaft 32 carries a worin 34 by which it lcontinually drives a worm gear 36 which is fast on a horizontal 1 shaft 38 mounted to turn in bearings formed I 40 is provided with a circumferential groovein which are received blocks 54 carried by a in aj bracket secured to theside of the machinehead. Splined on the shaft 38 and movable endwise thereon is a clutch member 40 provided on its respective end faces with teethy 42 and 44 arranged to engage alternately with similar teeth 46 and 48 formed on the end faces of beveled gears 5()` and 52 lwhich are mounted to turn loosely ,on the shaft 38. The teeth on the` clutch member 4() fand onf the beveled gears are so formed with reference to the direction of movement ofthemember 40 as to remain in engagement until a substantial resistance isencountered,v.ihereupon the teeth may slip in such manner as vto produce a series of rap-idly repeated short pulling impulses, but this particular arrangement of the teeth is not essential as far as the features of this inf vention areconcerned. The clutch member forked projection' on a hand lever 56 which is fulcru'med on the bracket at 58 and ex-y tends downwardly' and forwardly toward the front of the machine where its end is inturned to provide a handle 60 in such position that the operator as he stands in normal working relation to the machine, is enabled to manipulate it while watching the progress of the pulling action upon the upper. By raising the handle 60 the vclutch .member 40 is moved rearwardly along the shaft 38 to cause the teeth 42 to engage the teeth 46 and thereby impart turning movement'to the gear 50, while by lowering the handle the clutch member is moved in the opposite direction to cause the gear 52 to be driven.

The gears 50 and 52 are constantly in mesh with a beveled gear 62 fast on a vertical shaft 64 which is mounted to turn in vbearings in the bracket and the upper end of which is formed as a screw 66. The,screw 66 is threaded in a sleeve 68 which is rigidly attached to and projects forwardly from a slide'() vertically movable in a guide 72 and provided with rearwardly projecting, ears 74 and 76 between which is confinedl the end of a stud 7 8 extending outwardlyvfrom the rear end ofthe .updrawv lever 4.

In the operation of the machine comprising the construction thus far described, the usual machine clutch is actuated to `cause a partial rotation' of the cam shaft 10'and thereby to impart an initial pull to the upper at the sides andthe toe of the last,

whereupon the machine comes to rest with the upper at the sides of the last under tensio-n in proportion to the degree of compressionof kthe springs 16. These springs may be light enough to cause the upper simply to be gripped and straightened out upon the last, or they may be set to such v a tension `as `to produce a pull as much f stronger as may be desired. Vhile the ina- 'chine is at rest at the end of this initial movement, the auxiliary side 0*ripper operating means may be rendered eective by the manipulation of the handles 60. ln consequence of movement ofthese handlesV either together or'separatelyV in one direction or the other an additional pulling movement of such extent as may be desired may be. imparted to either or both of the side grip,-Y

pers, or one or both of the grippers may be moved in a direction to relax in a greater or less degree the tension of the upper effected .b v Vthe initial movement of the levers 4. Upon lrelative movement of the handles 60, moreover, the upper may, if desired, be adjusted transversely of the last.

The machine includes means vwhereby the side grippers may be locked Vagainst retractive movement from the position to which they are moved in the initial operation of the machine and also to cause them to retain the tension of the upper effected by the supplemental pulling movement. To this end, the front beveled gear 52 hasfrigid therewith ratchet wheels 8Oand 82 provided -with oppositely directed teeth with which coperate pawls 84 and v86 pivoted on a stud88. A spring 90 tends to move both pawls in such direction as to cause them to engage the teeth of their respective ratchet wheels. On the outer ends of these pawls are mounted rolls 92 and 94 and between these rolls is positioned a length-wise mov able rod 96 arrangedto slide in bearings in the bracket upon which i the shaft 38 is mounted. The rod 96 is provided with a recess for the reception of an upward extension 9S from the clutch controlling fork and is thus moved lengthwise in unison with the movement of the clutch member 40 by means of the hand lever 56. The rod 96 is provided with depressions 100 and 102 which are arranged to coperate respectively with the rolls 92 and 94 on the pawls, and with an intermediate portion of the full diameter between vthe two depressions which engages both rolls to position the pawls out oi' engagement with the ratchet wheels when the clutchv member 40 is in neutral position. Vhen the rod 96 is moved toward the front of the machine by a depression of the hand lever 56, the roll 94 of the pawl 86 will be received within the depression 102 and thus the spring 90 will be permitted to position the pawl 86 inengagem-entwith the ratchet wheel 82 in such manner as to hold the side gripper in the position to which it has been moved in the initial operation of the machine and also to retain whatever additional tension may be effected by the upward movement of the gripper by reason of the connect ion of the clutch member 40 to the gear 52 effected by the ,further depression of the hand lever 56. In the meantime the pawl 84 will continue to be positioned out of engagement with n the ratchet -wheel 80. If the hand lever 56 is uplifted to connect the clutch member 40 with the gear 50 for moving the gripper in such direction as to relaX the tension of the upper, the roll 92 will be caused to enter the depression 100 and permit the pawl 84 to engage the ratchet wheel and thus retain the gripper in such position as it may be caused to assume upon a relaxation of the tension, the pawl 86'mean while being held by means of the rod 96 out of engagement .with the ratchet wheel 82. The depressions 100 and 102 are somewhat elongated in order to permit either pawl to engage its ratchet wheel before the teeth of the clutch member 40 have engaged the teeth of the respective gear 50 or 52, thus affording provision for limited movement of the hand lever 56 to cause the gripper to he operated through the respective gear or to come to rest while `the pawl remains incooperative relation to its ratcliet-v.'iieel. l By such limited lmovement of the lever 56 the operator vis permitted to cause a plurality of movements to beimparted to the gripper at will while he observes the eifect uponthe upper stock, the gripper being retained meanwhile against movement in the opposite direction by the operation of the pawl and ratchet mechanism'.

On the upper side of the controlling rod 96 is a 'notch in which is received the wedgeshaped end of a spring plunger 104 to retain the rod normally in a position in which the clutch member 40 is inoperative to transmit movement to either of the gears 50 or 52 and both pawls are held out of engagement with their ratchet wheels, the retention of the pawls and the clutch member normally in Such neutral position being further insured spring plungers'lO arranged to engage a stud 107 projecting from a downwardly extending portion of the lever 56. The shape of the notch and oi' the plunger 104, however', is such as to afford only a yielding resistance to movement of the rod 96, thus permitting the operator to manipulate the lever 56 when he so desires, the

notch and the plunger a'ording, moreover,-

an indication of the neutral position of the parts of the controlling' mechanism. either side of the notch in which the plunger 104V is received, therod 96 is provided with a slot 106 arranged to receive the end of the plunger 104 when the rod 96 is moved from its central or'neutral position in one direction or the other. The slots 106 are suitably lelongated to' correspond toV such movement of the rod 96 as takes place during a movement of the lever 56 to connect the clutch member 40 to the teeth of the gear 50er 52 or to disconnect it therefrom while the pawl 84 or 86 remains in engagement with its ratchet wheel. The plunger 104 by engaging the rod at one end of the slot 106 will thus oppose a yielding resistance to continued movement of the rod in the same direction after disconnecting themember 40 from thel immediately adjacent teeth 467er 48 and will thereby afford the operator an indication of the extent of movement of the lever 56 which is permissible for disconnecting the clutch member from the teeth of the gear withoutdisconnecting the locking pawl. Between the limits ot movement of the rod thus determined by one end of the slot 106 and by the clutch teeth the plunger 104 will oppose no resistance to the free manipulation of the controlling mechanism. The construction thus facilitates precise and accurate control and enables the operator to cause. movements of the precise extent desired to be imparted to the gripper in succession without danger of retraction of the gripper from-the position to which it may have been already moved .by the operation ofthe hand controlled mechanism.

p Although the springs 16 are of Suicient Ystrength usually to retain .the sideV updraw levers substantiallyvin such position as they may assume by reason of a supplemental pulling movement effected by the mechanism hereinbefore described, itis preferable that the pawl 86 remain in efective engagement with its ratchet wheel 82 to retain the tension of the upper at least until such time as the grippers are moved inwardly to draw the margin of the upper over the bottom of the last in the usual manner in the final stage of the cycle of operations of the machine. In order to permit this it is necessary to keep the hand lever 56l depressed sufficiently to permit the pawl 86 to remain in engagement with the ratchet wheel 82 until after the machine clutch has been tripped to `cause the overlaying and fastening of the upper to be eifected. rlhe resistance to movement of the rod 96 effected by the engagement of the plunger 104 with the rod at one end of the slotl 106 is depended upon to retain the parts of the controlling mechanism in this position while permitting the oper- 4ator to release the handle 60. Itis impor` tant, however, in order to avoid breakage of any of the parts, such, for example, as the pawl or the slide 70, that the pawl be disengaged from the ratchet wheel before the parts of they machine are returned to their initial positions subsequent to the release of the upper by the grippers. In order to insure such release of the pawl, the rod 96 is provided with a recess 108 having upper edges sloping lengthwise of the rod, and arranged for engagement with the rod in this recess is a wedge-shaped' dog 110 carried by a bar 112 which is operated at suitable times to cause the dog to be withdrawn from the recess and thus permit the operation of the manualcontrolling means or to enter the recess and thereby either return or insure the return of the rod and the parts connected therewith to their neutral or inoperative positions. Conveniently the rod v112 is carried by a slide 114 with which the machines of the illustrative type are pro-V vided for the purpose of oscillating the tack pot of the machine through connections with a rod 116 extending upwardly from the slide, the slide being moved upwardly in the first stage of the cycle ot operations, during which the initial pulling movement of the grippers is effected, by means of an eccentric 118 on the cam shaft 10, and moved downwardly in the iinal stage of the cycle ot operations during which the margin of the upper is drawn over the bottom of the last and fastened. It will be evident, therefore, that when the machine is at rest prior to its operation upon a shoe, the dog 110 will be positioned within the recess 108 and by locking the rod 96 will thusnot only cause the pawls 84 and 86 to remain out of engagement with their ratchet wheels, but will also prevent such manipulation of the hand lever 56 as to cause power to be transmitted to either of the gears 50 or 5,2. Eiiective insurance is thus afforded againstaccidental manipulation yof the lever 56`at the wrong'tim'e with consequent danger of breakage. In the ini'-v tial stage of the cycle of operations the dog 110 is withdrawn to release the rod 96 and thus leaves the mechanism `free for manipulation by the operator during the time when the machine is at rest with the upper under the initial tension. In the final stage of the cycle of operations and prior to any such movement of the parts as might tend to cause breakage, the dog isA again moved downwardly and byy engagement with one of the sloping faces ofthe recess 108, in case the rod 96 is still positioned to permit one of the pawls to engage its ratchet wheel,`im

parts such movement to the rod as to dis# engage the pawl, the downward movement ot' the dog in any event serving to insure that the parts of the controlling mechanism shall be in their inoperative positions and to lock the parts in such positions untiltheir subsequent release during the operation of the machine uponvanother shoe.

The dog 110 is rigid with a rod 120 which is adjustable vertically in the end of the bar 112 and is provided with a slot in which is received a flange 122 on an'adjusting screw 124 which may be manipulatedV to raise or lower the rod 120 relatively to the supporting bar. It vwill be evident that by the use oi this adjusting mechanism the dog 110 may be accurately positioned to cause it to lock or to'unlock the rod 96 at precisely the time'desired, the dog and the recess 108 be# ing so formed relatively as to permit the dog to have a greater or less extent of lost mov tion while still positioned inthe recess. f

While the invention is herein illustrated in its application to a machine of the type disclosed in the'prior patent mentioned, it will be understood that in many of its aspects the invention isV not limited to machines of that particular type. Y

Having ldescribed the invention, what I claim as new and desire to secure by Letters Patent of the United States is: 1. In a pullingsover machine, the combination with a gripper and'means for operating the gripper to cause it to ull an upper and to corne to rest while holdin the upper under tension, of power operate means for imparting subsequent movement to the gripy per of variable extent as determined by'the operator and in a direction to relax the tension of the upper, manual means Jfor con trollingthe operation of said power oper-V ated means, and means forlocking said many ual means against operative movement in a direction for relaxing the tension until after the machine has been started .for effecting said first mentioned pulling movement of the e gripper.

2. In a pulling-over machine, the combination with a gripper and means for operating the gripper to cause it to ull an upper and to vcome to rest while holding the upper under tensionv` of power operated means for imparting subsequent movement to the gripper of variable extent as ldetermined by the operator and in a direction to relax the tension of the upper, manual means for con trolling the operation of said power operated means, means for normally locking said manual means against operative movementin a direction for relaxing the tension, and power operated means for unlocking said'manual means after the machine has been started for effecting said first mentioned pulling movement of the gripper.

3. In a pulling-over machine, the combination witha gripper and means for op-v erating the gripper to cause it lto pull an upper andV to come to rest while'holdingV the upper under tension, of power operated means for subsequently moving the gripper either to increase or to relax the tension of the upper, manual means movable in opposite directions to initiate .the operation of said powerv operated means for increasing and relaxing the tension respectively, and means fork locking: said; manual means against movement in either direction vuntil after the machine has been started-for effecting said first mentioned pulling movement of the gripper.y Y Y .4.,I-n a pulling-over machine,V the combinationwith a gripper and means for operating the gripper to cause it to pull an upper andto come to rest` whil'e vholding the upperv under tension, of.v power operated means for subsequently moving the gripper either toincreasel or to -relax the tension of the upper, manual meansmovable in. op-

posite ydirections to initiate the operation of said power o'peratedmeans for increasing andrelaxing the tension respectively, means for normally lockingV said manual means against movement in either direction,A and means automaticallyoperative to unlock said manual means after the machine has been started foreffecting .said first Vmentioned pulling movement ofY theV gripper.'

"5. In va pulling-ovenmachine,ithe combination with a gripper vandmeans -for operating ,the gripper -t'o lcause itto pull an `upper and to come to rest while holding the upper under tension, of power` operated means fork imparting a supplementalpullingmovement to the gripper,manual` means for initiating theoperation o fsaid poweroperated means, means ,for klocking the 'gripper with the upper under tensionatthe end of sai'd supplemental movement, andl mechanism for operating 'said locking means subsequentlyto 11nlo'ck the gripper, s aid mechanism being constrlitedend arranged te .100k Said manual means in position to prevent the operation of' saidl supplemental pulling means until after the. maihine has been started'for effecting said first mentioned pulling movement of the gripper on another shoe.

6, In a pulling-over machine, the combinationwith a Vgripper and means for operating the gripper to cause it to pull an upper and to come to rest while holding the upper under tension. ofpower operated means for imparting a supplemental pulling movement to the gripper, manual means for initiating the loperation of said power operated means.' -means for locking the gripper with the upper under tension at the end of said supplemental movement, and a single means for operating said locking means subsequently to unlock the gripper and for locking said manual'means'in an inoperative position to prevent the operation of said supplemental pulling means until after the machine has been started for effecting said first mentioned pulling movement of the gripper on another shoe.

T. In a pulling-over machine, the oombination with a gripper, of'power operated means for imparting an upper pulling movement to the gripper, manual means for initiatingr the operation of said power operated means, and means for locking said manual means normally'against operative movement comprising a member arranged for movement in unison with the movement of the manual means, said member having a recess therein, and a locking member arranged to enter said recess 8. In a pulling-overV machine, the Vcombination with a. gripper, of power operated means forimparting an upper pulling movement-to the gripper, manual means for initiating the operation ot said power operated means, a member movable in unison with the movement vof said manual means, said member having a recess therein, a locking member .arranged to enter said recess, andV power operated means for withdrawing the locking member from said recess. j

9. Ink a pulling-over machine vthe coin hination with a gripper, of power operated means for imparting movement yto the gripper either'to pull an-upper or to relax the tension ofthe upper, manual means comprisin gj a clutch member .movable in 'opposite directions to initiate the operation of said power operated means for increasing and relaxing the tension respec tively,.a rod connected to th@ clutch member for movement lengthwise in unison with said member, and means for locking said rod normally against movementin either direction.

10; In a pulling-over machine,the combination .withv a gripper, of power-operated means for imparting an upper pulling moveits ment to the gripper, manual means for initiating the'operation of said power operated means, a rod movable lengthwise in unison with the movement of saidV manual means, and power operated means arranged to act through said rod to insure the return of said manualmeans to an inoperative position.

11. In a pulling-over machine, the combination with a gripper, of power operated means for'vmoving the gripper to pull an upper including a clutch member movable into or out of position to transmit movement to the gripper, manual means for moving said clutch member, means' Jfor locking the gripper with the upper under tension, a member for controlling said locking means, mechanism arranged to act through said member to insure the subsequent unlocking ofthe gripper, and a connection between said controlling. member and the clutch member for controlling theposition oftheV clutch member.

. 12. VIn apullingover machine,.the combi-V nation with a gripper, of power operated means for moving the gripper to pull anupper including a clutch member movable into or out -of Vvposition to transmit movement to the gripper, manual means vfor moving said clutch member, pawl andl ratchet mechanism for'locking the gripper with the upper under tension, means for controlling said pawl and ratchet mechanism to cause the gripper to be locked or unlocked compris ing a lengthwise movable rod, means arranged to act through said rod to insure the subsequent unlocking of the gripper, and additionalmeans comprising a connection between thel rod and the clutch member to in-.

sure that the clutch member shall be located in an inoperative Vpositionwhen the gripper is unlocked. f A

,13..In a pulling-over machine, the combination with a gripper, of power operated means for movingthe gripper to pull an upper, manualmeansfor initiating the operation of said power operated means including a Aclutch member movableinto or out of' pos ition toy transmit movement to the gripper, a' .controlling member movable in unison with said clutch member, said controlling member having a recess therein, apower op'- -erated slide, Vand locking member carried Y bvfsaidhslide and movable intoand out of.

said'recess respectively at `different times in thejcyclefof` operations of the machine.

le. In 'a pulling-,Over `I'nachin'egftheQ-combinationwith a gripper,lof a power shaft,

means for operating the gripper through the movement fof said shaft, manual means for locking the gripper against retractive movement, a member for operating said locking means to unlock the gripper, and' means 'for transmitting operativemovement from the power shaft tosaid member. l d i against retraction, and means affording theV operator an indication of the extent of such limited movement ofthe controlling means.

16. ,Inf a pulling-over machine, the combination with a gripper, of power driven operating mechanism, manual controlling meansv forrendering said mechanism e'ective Or ineffective to, impart movement to the gripper, a locking device arranged to be controlledby said manual meansv to ren'-V a v der Ithe device effectiveor ineffective to prevent retraction ofthe gripper,' s`ai d manual means being arrangedwith freedom for unobstructed, limited movement to connect theV power mechanism to the gripper or to dis- I connect it therefrom while the locking device,l remains operative to holdthe Vgripper against retraction, and 'means Vfor yieldf Vingly opposing further movement of the controlling means at theen'd ofsaidlimited movement ina direction to disconnect the power lmechanism from the gripper. y

l17, lIn a pulling-over machine, the combination with a gripper, ofpower driven, operatingV mechanism, manual controlling means for rendering ,said mechanism effec.- tive for ineffective to: impart movement tol the. `gripper,y av locking device'` arranged Vto be controlled b-v said ,manual means Vto render the'deviceeffective or ineffective to prevent retraction kof the.-gri pper, saidV manual means Vbeing constructed andlarranged for limited, movementfto connect' thepower mechanism to .the gripper or'to'o disconnect it therefromrwhilerthe Vlocking device ref mains operative to holdthe gripper against retraction, the machine j` includingA a member movable, V inlA unison with said manualJ means andjhaving'anfelongatedrslot therein, and a dag arranged 'for yielding`@11sinsertientwithv the kmember in, said slot to afford the operatorlan indication of the extent of, said Vlim'- ited movementjof the controlling means.

18.` In a'nupp'erfpu'lling machine, the com-`v bination'with an upper Apulling gripper, of power operated meansforimparting to said gripper-movement either iii al direction to pullfan upper or vin aV direction to relax teni sion 'A applied to` the upper, manual control-r Y Y lingmean's operative bym'ovements in op-A posite directions respectively to initiate power operation of the gripper to pull or to relax the tension, and mechanism normally operative to lock said controlling means against movement in either direction.

19. In an upper pulling machine, the combination with an upper pulling gripper, of power operated means for imparting to said gripper movement eithei` in a direction to pull an upper or in a direction to relax tension applied to the upper, manual controlling means movable in opposite directions respectively to cause the gripper to pull or to relax the tension, and mechanism automatically operative in the return of the power driven parts of the machine to starting position to lock said controlling means against movement in either direction.

In testimony whereof I have signed my name to this specication.

JOHN T. LANCASTER. 

